Cracking Hydrocarbons

Question 0

Two properties of short chain hydrocarbons?

Answer 0

Thin and pale with a low boiling point

Question 1

Two properties of long chain hydrocarbons?

Answer 1

High boiling points and viscous (gloopy)

Question 2

What has higher demand - long or short chain hydrocarbons?

Answer 2

Short

Question 3

How do they meet this demand?

Answer 3

CRACKING!

Question 4

Cracking is a form of?

Answer 4

Thermal decomposition

Question 5

Cracking produces?

Answer 5

Shorter hydrocarbons and alkenes (which are used in polymers)

Question 6

What state are hydrocarbons in when they pass over the catalysts?

Answer 6

Vaporised

Question 7

What do you you heat in the cracking process?

Answer 7

Both the paraffin and the catalyst until the paraffin has vaporised and the catalyst is glowing red.

Question 8

Two catalysts?

Answer 8

Silica and alumina

SiO2 Al203

Question 9

After heating what happens next?

Answer 9

Smaller alkanes collect in the test tube while alkenes bubble through water and are collected in a gas jar